#2 It is a money match
At the end of the day, WWE is a business, and the primary objective is to maximize the profit made. We got a rematch of John Cena and The Rock at WrestleMania 29 because of the exact reason - profit. Their once in a lifetime bout at WrestleMania 28 sold tickets and got them more than enough sponsorship deals to convince WWE to have a rematch between the icons.
Similar to The Rock and John Cena, Batista is also a famous Hollywood superstar - well known for his role as Drax The Destroyer in the Marvel Cinematic Universe. Brock Lesnar does not need any introduction when it comes to his drawing power. The Beast is one of the biggest box office attractions when it comes to combat sports.
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Thus a match between these two powerhouses will boost WWE's profit as they have proven their drawing power numerous times.